Synthesis of hepatic secretory proteins in normal adults consuming a diet marginally adequate in protein
Jackson, Alan A., Phillips, Gary, McClelland, Irene and Jahoor, Farook (2001) Synthesis of hepatic secretory proteins in normal adults consuming a diet marginally adequate in protein. American Journal of Physiology: Gastrointestinal and Liver Physiology, 281, (5), G1179-G1187.
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The plasma concentration and hepatic synthesis rates of albumin, transthyretin, very low-density lipoprotein apolipoprotein B-100 (VLDL-apoB-100), high-density lipoprotein apolipoprotein A-1, fibrinogen, α1-antitrypsin, and haptoglobin were measured in six normal adults before and after consuming a protein intake of 0.6 g · kg body wt-1 · day-1 for 7 days. The synthesis of hepatic proteins was measured from the incorporation of [2H5]- phenylalanine, following prime/continuous infusion, using plasma VLDL-apoB-100 isotopic enrichment to represent the precursor pool. Synthesis of albumin declined by 50% (P < 0.001) following the lower-protein diet, VLDL-apoB-100 declined by 20% (P < 0.001), and apoA-1 declined by 16% (P < 0.05). By contrast, synthesis increased for fibrinogen (50%, P < 0.05) and haptoglobin (90%, P < 0.001). This pattern of change, with decreased synthesis of nutrient transport proteins and increased formation of acute-phase proteins, suggestive of a low-grade inflammatory response, was accompanied by increased plasma concentration of the inflammatory cytokine interleukin 6 (30%, P < 0.05). The pattern of change in the synthesis of hepatic secretory proteins following 7 days on the low-protein diet may be of functional relevance for lipid transport and the capacity to cope with stress.
|Keywords:||protein synthesis, phenylalanine, albumin, transthyretin, very low-density lipoprotein apolipoprotein B-100, high-density lipoprotein apolipoprotein A-1, fibrinogen, alpha 1-antitrypsin, haptoglobin|
|Subjects:||R Medicine > R Medicine (General)
Q Science > QP Physiology
|Divisions:||University Structure - Pre August 2011 > School of Medicine > Developmental Origins of Health and Disease
|Date Deposited:||11 Apr 2006|
|Last Modified:||01 Jun 2011 06:26|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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